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Australian AMC 2015 - Senior Question 5

AMC AUSTRALIA · Australian AMC 2015 - Senior

Question 5

$3^{-2}-2^{-3}$ equals
  1. −1
  2. 0
  3. $-\frac1{72}$
  4. $\frac1{72}$
  5. $\frac{17}{72}$